Acanthosis nigricans

AN; Skin pigment disorder - acanthosis nigricans

Acanthosis nigricans (AN) is a skin disorder in which there is darker, thick, velvety skin in body folds and creases.

Acanthosis nigricans - close-up

This photograph demonstrates the hyperpigmented, brownish, velvety lesions of acanthosis nigricans. This skin condition may occur in skin folds such as the axilla (armpit - pictured here), neck, and other areas. In adults, it may be associated with hormonal problems, internal malignancy, obesity, and drugs.

Acanthosis nigricans on the hand

This photograph demonstrates brownish, hyperpigmented, velvety plaques overlying the joints of the hands (metacarpal and interphalangeal joints).

Causes

Symptoms

Exams and Tests

Treatment

Outlook (Prognosis)

When to Contact a Medical Professional